Two-color printing press



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Feb. 23, 1943 w. R. HILDEBRAND TWO COLOR PRINTING PRESS Filed June 27, 1941 Q SheebS--Sheveb 2 au, R n, Lw

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BY l ATTORNEY Feb. 23, 1943. w. R. HILDEBRAND 2,312,037

TWO COLOR PRINTING PRESS l Filed June y2v, 1.941 9 sheets-sheet s ATTORNEY A Feb.l23, ll943. w. R. HILDEBRAND 2,312,037 'TWO COLOR PRINTING PRESS Filed June 27, 1941 9 Sheets-Sheet 4 ad a j lNvErNTo'al A Mmm Hag/mnd ATTRNEY l Feb. 23, 1943. w. R. .WLDEBRAND 2,312,037`

TWO COLOR PRINTING PRESS Filed June 27, 1941A Q-Shee'ts-Sheet 5 INVENTOR Feb 23,'l943 w. R. HILDEBRAND 2,312,037

TWO COLOR PRINTING PRESS.

Filed June 27, 194:1 9 Sheets-Sheet 6 v INVENTOR ATTORNEY Feb' 23, l943- w. R. HILDEBRAND 2,312,037

TWO COLOR PRINTING PRESS Filed June 27, 1941 4 9 Sheets-Sheet 8 Figli Feb' -234: 1943 w. R. HILDEERAND 2,312,037 Two COLOR PRINTING PREss Filed June 27. 1941 9 sheets-sheet 9l INVENTR Willie/nl R Hz'ldefafzd Patented Feb. 23, 1943 UNITED STATES PATENT @ENCE TWO-COLOR PRINTING PRESS William R. Hildebrand, New York, N. Y.

Application June 27, 1941, Serial No. 399,985

7 Claims.

This invention relates to new and useful improvements in printing presses.

More specifically, the invention contemplates the construction of a one cylinder two color press. The invention proposes that the one cylinder be provided with the usual gripper mechanism, but which is operated to retain the sheet for a minimum of two revolutions, and proposes that the printing take place during these revolutions. With this arrangement the registration may be especially accurate because the gripper mechanism does not release the sheet during the two color printing operation.

Still further the invention proposes to characterize the two color press by providing it with a form` holder reciprocally mounted on a frame beneath said cylinder. mentioned in the previous paragraph which comprises the counter-pressure cylinder for the press, and it is proposed that the form holder be provided with two form sections with their leading edges spaced a distance preferably equal to the circumference of the counterpressure cylinder. Furthermore, it is proposed to provide an ink supply means for each of the form sections arranged to individually ink the sections during the operation of the press.

Still further the invention contemplates mounting each of the ink supply means to move vertically and to have form rollers which in the lowered positions of the ink supply means contact said form sections.

Still further it is proposed to provide means for alternately raising and lowering said counterpressure cylinder for periods of 21/2 revolutions so that in its raised position the form sections may pass freely, and in its lowered positions it will engage the form sections when they pass.

Another object of the invention is to ,provide the press with means for moving said form holder in one direction for one stroke of its reciproca'tion while said counter-pressure cylinder is raised, and in the other direction for another stroke of its reciprocation while the counter-pressure cylinder is lowered.

It is also proposed to provide means for alternately raising and lowering said ink supply means so that in the lowered position of one of the ink supply means, one of said form sections will be inked once during each period cf reciprocation of said form holder, and in the lowered position of the other of said ink supply means the other form section will be inked once during each period of reciprocation of said holder.

It is also contemplated to provide the press with means for operating said gripper means to hold a sheet of paper on said counter-pressure cylinder for two revolutions thereof during a period that said counter-pressure cylinder is down to print said sheet with both of said form sections. and it is proposed that the start of the gripping operation be repeated once for every five revolutions of the counter-pressure drum. With this arrangement a particularly efficient two color press is obtained.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawings forming a rnaterial part of this disclosure:

Fig. 1 is a side elevational view of a one cylinder two color press constructed in accordance with this invention.

Fig. 2 is a plan view of Fig. 1.

Fig. 3 is a transverse vertical sectional View taken on the line 3 3 of Fig. 1.

Fig. 4 is a fragmentary side elevational view similar to the central portion of Fig. 1 but illustrating the parts in a different position.

Figs. 5-13 inclusive are views similar to Fig. 4 but illustrating the parts in different positions so as to more clearly disclose the various phases of operation of the machine.

Fig. 14 is a fragmentary enlarged vertical sectional View' taken on the line Ill-I4 of Fig. 3.

Fig. 15 is an elevational view of one of the cams of the machine, specifically the cam seen looking in the direction of the line |5|5 of Fig. 3.

Fig. 16 is an elevational view of another one of the cams of the machine, specically the cam seen looking in the direction of the line Iiii6 of Fig. 3.

The one cylinder two color press, in accordance with this invention, includes a frame 20. A form holder ZI is reciprocally mounted on the frame 20 and has two form sections 22 and 23. A counterpressure cylinder 24 is arranged above the form holder 2 I and is indirectly supported on the frame 20 as will be hereinafter more fully described. The counter-pressure cylinder 24 is provided with gripper means including the gripper lingers 25 (see Fig. 14) for engaging the lead edge of a sheet of material to be printed which, preferably, is of a length equal to or less than half the circumference of said counter-pressure cylinder 24. A sheet of this type is schematically illustrated in Fig. 4 and other figures by reference letter S. The gripper means of the counter-pressure cylinder 24 is schematically indicated in Fig. 4 and in other of the figures by reference letter G. The two form sections 22 and 33 have their lead edges 22a and 23a spaced a distance equal to the circumference of the counter-pressure cylinder 24.

The form holder 2| is provided with several flanges 25 which support rollers 21 engaging tracks 28 supported upon partition walls 29 mounted within the frame 2i). The form holder 2| is also provided with a central downwardly extending bracket 38 which is xedly mounted upon the holder 2| withfastening elements 3|. 'Ihis bracket 36 is provided with a plurality of rollers 32 mounted on its bottom portion and engaging another track 33 supported cn the walls 29 of the frame 20. The counter-pressure cylinder 24 is mounted on a shaft 34 which has its ends rotatively mounted in slides 35 slidably mounted upon the side walls of the frame 20.

of the slides 35. This shaft 6| is provided with gears 82 meshing with gears 63 rotatively supported on the slides 35. Ihe gears 63 mesh with gears 64 on the ends of the shaft 55 which is rotatively supported on the slides 35.

The gears 64 mesh with gears 66 rotatively supported on the slides 35. The gears 66 mesh with gears 61 mounted upon the ends of the shaft 34 which supports the counter-pressure cylinder 24. The endless driving element 59 is engaged by an idler 68 which is mounted on an arm 69 pivotally supported by a pintle 19 mounted on the frame 20. A spring 1| acts between the frame 20 and the arm B9 for normally urging the idler 68 to tension the endless drive mermber 59. The arrangement is such that rotation of the motor 55 indirectly rotates the counterpressure cylinder 24 continuously in a counter- An ink supply means is provided for each of the form sections 22 and 23 and essentially comprise brackets 33 vertically slidably mounted in guidemembers 31 mounted on the frame 20. These brackets 33 support ink pads 38 which are associated with a plurality of furnishing rollers 39 cooperating with form rollers 49 which in the lowered positions of the ink supply means are adapted to Contact the said form sections 22 and 23. In raised positions of the ink supply means, the form rollers 40 are sufficiently elevated so that the form sections 22 and 23 may pass without receiving ink.

Means is provided forV alternately arising and lowering `said counter-pressure cylinder 24 for periods of 2% revolutions thereof, so that in its raised position the form sections 22 and 23 may pass freely beneath it, and in its lowered positions it will engage the form sections when they pass. This means is characterized by levers 4| Y which are pivotally mounted intermediate of their ends by pintles 42 supported on the framel 29.

The levers 4| are provided with slots 43 which are engaged by pins 44 mounted on the slides 35. The other ends of the levers 4| are provided with slots V45 which are engaged by pins 46 mounted on'one of the ends of the levers 41. 'Ihese levers 41 are pivotally mounted intermediate of their ends on a shaft 48 extending transversely across the frame 28. This shaft 48 is provided with a radial arm 41a having a roller 49 which engages against a cam 50.

The cam 50 is iixedly mounted on a shaft 5| which 4is rotatively supported rcn the frame 20. The kshaft 5| is provided with a sprocket 52 cngaged by a driving chain or `element 53 which engages over a sprocket 54 on a shaft 55 of a prime mover, such as an electric motor 56. The cam 56 has va low area 5i)a extending substantially one-half of its circumference, and a high area 56h extending the other half of its circumference. With this arrangement the counterpressure cylinder 24 will be in a lowered position when the roller 43 engages the low area 5|!a of the cam 55. The counter-pressure cylinder 24 will be in a raised position when the roller 49 engages the high area 5|!b of the cam 50.

Means isA provided for rotating said counterpressure cylinder continuously in the same direction. This means includes a sprocket 58 mounted on the shaft of the electric motor 56. An endless driving element 59 engages over a sprocket 58 land extends upwards and engages over a sprocket 60 mounted on a shaft V6| which extends transversely of the frame 28 and which is rotatively supported from projecting arms 35a clockwise direction in relation to Fig. 4 and similar other figures.

Means is provided for moving the form holder 2| in one direction for one stroke of its reciprocation, while said counter-pressure cylinder 24 is raised, and in the other direction for another stroke of its reciprocation while said counter pressure cylinder 24 is lowered. This means is characterized by opposed racks 13 and 14 mounted upon the top and bottom edge portions of a longitudinal opening 15 formed in the bracket 33. A gear 16 is mounted on the shaft 65. This shaft 65 passes through slots 11 formed in the walls of the frame 20 so asv not to interfere with upward and 'downward motion of the slides k35. In the normal position of the slides 35, the gear 16 engages theV top rack 13. In lowered positions of the slides 35, the gear 16 engages the bottom rack 14.

Since the shaft 65 is contained in the drive train of thefcounter-pressure cylinder 24 it will always rotate in the same direction. However, the form holder 2| will be driven in one direction, or the other, depending upon whether Vthe gear E6 is in mesh with the rack 13, or whether the gear 15 is in mesh with the rack 14.

It should be noted that when the slides 35 are in their raised positions, the counter-pressure cylinder 24 will be in its raised position. In this position of the cylinder 24, the gear 16 engages the top rack 13, and consequently the form holder 2| will be driven in one direction. Similarly, when the counter-pressure cylinder 24 is in its lowered position, the gear 16 will engage the bottom rack 24 to drive Vthe form holder in the opposite direction.

Means is provided for alternately raising and lowering the said ink supply means so that in the lowered position one of said form sections 22 or 23 will be inked once during each period of reciprocation 'of the form holder 2|, and in the lowered position of the other of said ink supply means, the other form section will be inked once during each period of reciprocation of said form holders.

The means for raising and lowering the ink supply means illustrated to the left of the counter-pressure cylinder 24, as illustrated in Fig. 4, includes a rod connected with the bracketJ 36 and extending downwards and pivotally connected with one arm of a bell crank 8| whichis pivotally supported intermediate of its ends by a pintle S2. A link 83 connects the other arm of the bell crank 8| with a point eccentric on a disc B4 which is turnably supported concentrically by a pintle 85 mounted on the frame 23. The ink supply means to the right cf the counter-pressure cylinder 24 has its bracket 36 supported by a rod 86 which extends downwards and pivotally connects with a bell crank 81 which is pivotally supported intermediate of its ends by a pintle 88 mounted on the frame 20. The other end of the .bell crank 81 pivotally connects with a link 89 which is pivotally connected eccentrically on the disc 84.

A pair of upwardly and forwardly inclined arms 90 are pivotally mounted at their bottom ends by -pintles 9| on the frame 20. Another pair of parallel arms 92 is pivotally connected with the parallel arms 90 to form a parallelogram of arms. One of the arms 92 has a projecting end portion 92a which is provided with a roller 93 engaging against, a cam 94. This cam 94 is mounted on the shaft 5|. A spring 95 is connected with one of the levers `90 and with the frame 20 for normally urging the parallelogram of arms in a direction that causes the roller 93 to engage the cam 94. A link 96 has one of its ends pivotally connected with one of the arms 92 and its other end pivotally connected eccentric of the disc 84.

The cam 94 has a low area 94a for substantially one-half of its periphery and a high area 94b for the remaining half of its periphery. The arrangement is such that when the roller 93 engages the high area 94b the parts will be in the positions as illustrated in Fig. 4 in which the ink supply means to the left of the counter-pressure cylinder 24 in its raised position and the ink supply means to the right of the counter-.pressure cylinder is in its lowered position. When the roller 93 engages the low area 94a of the cam 94, for example, as shown in Fig. 3, the ink supply means to the left of the counter-pressure cylinder 24 will be in its lowered position and the ink supply means to the right of the counter-pressure cylinder 24 will be in its raised position. When the high portion 94b engages the roller 93 the parallelogram of arms will be forced downwards so that the disc 84 is turned slightly clockwise. When the roller 93 engages the low portion 94a of the cam, the spring 95 will move the parallelogram of -arms upwards and slightly to the left so that the disc 84 is turned counterclockwise to reverse the positions of the ink sup- -ply means.

Means is also provided for operating the gripper means of the counter-p-ressure cylinder 24 which is characterized by the gripper fingers 25 (see Fig. 14). This means is arranged to hold a sheet of paper on the counter-pressure cylinder 24 for two revolutions thereof during the period that said counter-pressure cylinder is down to print said sheet with both of said form sections 22 and 23. and the start of the gripping operation repeating once for each five revolutions of the counter-pressure cylinder 24. The gripping means is of conventional design except for the way in which it is caused to open and close. The gripping means characterized by a recess formed in the cylinder 24 in which the usual brackets IOI are mounted which support the usual shaft |02 upon which the gripping fingers 25 are mounted.

Resilient means |03 act to normally urge the gripping fingers 25 into their closed positions. One end of the shaft |02 extends from the end of the cylinder 24. .A finger |05 (see Figs. 3 and 14) is mounted on this projecting end of the shaft |02. This finger |05 controls the opening of the gripping fingers 25. A mechanism is provided to operate the iingers 25. This mechanism includes a lever |06 pivotally mounted at its bottom end by a pintle |01 upon the adjacent slide 35. The lever |06 is urged towards the fingers |05 by an expansion spring |08 mounted between the lever I 06 and the slide 35. The lever |06 is held laterally in an inoperative position by the following mechanism.

A pin |09 eng-ages a slot I I0 formed in a bracket attached on the lever |06. The pin |09 is mounted upon a slidably mounted rod I II which extends downwards along one of the walls of the frame 20.

The rod III has a laterally offset middle section I I le. The botto-m end of the rod III is provided with a roller I I2 which engages a cam I3, see Figs. 3 and 15, which is mounted on the shaft 5|. This cam ||3 has two low spots II3a set at positions from each other representing two rotations of the cylinder 24. The arrangement is such that when the roller IIZ reaches a low spot II3a, the spring |08 will move the lever |06 towards the end of the cylinder 24. Then the tail end of the finger |05 Will engage the lever |06, see Fig. 14, to pivot open the gripper fingers 25. This is the condition of the parts shown in Fig.

. 4. An ejecting pin I I5 is provided for each gripper finger 25. These pins are urged inwards -by springs II6. The 4pins II5 are urged outwards by projections II1 on the hubs of the gripper ngers 25 engaging the inner ends of the pins II5. The arrangement is such that when the gripper ngers are opened the pins II5 extend upwards.

Means is provided for forcing the lead end of the sheets into a position in which the gripper fingers 25 may grip the same. This means is characterized by pusher fingers |20. These `pusher fingers are mounted on a rod I2I which is journaled on standards |22 mounted on the frame 20. A radial arm |23 projects from the rod I2I and is pivotally connected with la rod |24 which slidably engages through a bearing |25 mounted on the frame 20. The rod |24 is also provided with a laterally offset middle portion I 24e similar to the rod III. The bottom end of the rod |24 is provided with a roller |26 which engages a cam |21 (see Figs. 3 and 15). This cam |21 is mounted on a shaft |28 provided with |a pinion |29 meshing with a pinion I 30 on a shaft I3I rotatively supported. This shaft |3| is provided with another pinion |32 meshing with a pinion |33 mounted on the shaft 5|.

The arrangement is such that rotations of the shaft 5I indirectly rotate the cam |21 in synchronization with the cam 94. The cam |21 has one high spot |21a which forces the roller |26 upwards to move the rod |24 upwards which pivots the rod |2| causing the pusher fingers |20 to push the lead edge of a sheet of paper downwards for the gripper fingers 25 to catch.

The press, in accordance with this invention, is also provided with the usual accessories associated with presses. For example, Figs. 1 and 2 illustrate the usual means for supplying the press With sheets of paper. There is the usual holder |35 for a stack of sheets of paper and the usual mechanism |36 for feeding one sheet at a time to the usual conveyor |31 which moves the sheet forwards to a position in which its lead edge may be engaged by the gripper means of the counterpressure cylinder 24. The press is also provided with a take-off conveyor |38 arranged to catch the lead edge of a discharged sheet and carry the sheet along to a stacking table |39. The details of these mechanisms will not be'given in this specication as they form no part of the invention. The press may also be provided with the customary ink drying means and other devices associated with presses.

V'I'he operation of the press may be best understood by examining Figs. 4-13 inclusive which clearly Aillustrate the cycle of operation. Starting with Fig. 4 it should be noted that the sheet S is moving towards the counter-pressure cylinder 24 into a position in which the gripper means G of the counter-pressure cylinder will grip the lead edge of the sheet. At this moment the printing forms 22 and 23 are to the left of the cylinder 24.

The gripper means G is at the top. The cylinder 24 is in a raised position, indicated by the adjacent arrow, and the inking means is arranged so that one is up and one is down as indicated by their respective arrows. The printing form 23 at this moment is already inked since it previously.

passed the inking means at the right which is down. This may be understood from the subsequent description of the operation. The form holder 2| is in a position near its eXtreme left hand end. The nextinstant the lead edge of the sheet S is gripped.

Fig. 5 illustrates the position of the various parts with the counter-pressure cylinder 24 turned M1' of a revolution from the position shown in Fig. 4. Note the gripper point G. The sheet S is now being carried around by the cylinder 24. The form holder 2| is now in its extreme left position and already to start moving towards the right. The cylinder 24 is still raised and the inkingr means is still in a position as shown in Fig. 4. The next instant the roller 43 engages the start of the low area 53a of the cam 50. This indirectly causes the slides to move downwards so that the counter-pressure cylinder 24 is now in its lowered position. This engages the gear 16 against the bottom rack J4 and a l 1A; of a revolution later of the cylinder 24, the parts will be in the position illustrated in Fig. 6.

In Fig. 6 the cylinder 24 is now in its half a revolution position. Note the gripper point G. 'I'he lead sheet is now aligned with the lead edge of the printing form 23. The inking means are still in the same positions in which they were during Figs. 4 and 5. The first coloi` is no-w being printed.

Fig. 7 illustrates the position of the parts onehalf revolution later which represents a complete revolution of `the -cylinder 24. Note the gripper point G. At this point of operation the roller 93 engages the low portion of the cam 94 which causes the inking means to reverse, that is, the inking means to the left of the cylinder 24 is now down and the other means to the right of the cylinder 24 is now up. The inking means now to the left, engages the printing form 22, inking same. The form holder 2| is still traveling towards the right. v

Fig. 8 illustrates the relative positions of the parts one-half revolution later, which represents l 1/2 revolutions of the cylinder 24 from its starting position. Note the position of gripper point G. In Fig. 8 the sheet S is now in a position where its lead edge aligns with the lead edge o-f the form section 22 which has just been inked. The yform holder 2| is still traveling towards the right.

Fig. 9 represents the parts one-half revolution of the cylinder `24 later from the position shown in Fig. 8. Note gripper point G. This represents two complete revolutions of the cylinder 24. At this point of the operation the sheet S has been printed twice, once by the form 23 and once by the form 22. Attention is called to the fact that the ink means to the right of the. cylinder 24 is up so thai-form 22 may pass rit without Vreceiving ink. At this point the roller ||'2 rides into a low spot ||3a of the cam 3 which causes the lever |06 to move towards the finger m5. YThis indirectly opens the gripper lingers 25 and the pins I5 eject the lead edge of the sheet which is then caught by the take-off conveyor system.

Three-quarters of a revolution later, note gripper point G, the parts are in the positions illustrated in Fig. 10 which represents 2% rotations of the cylinder 24 from its starting position. At this point the form holder 2| is in its extreme right position. The roller 49 rides up on the high portion 50h of the cam 5|) which indirectly causes the cylinder 24 to move upwards. This causes the gear 16 to engage with the bottom rack 14. The form holder will now move towards the left. The sheet S at this moment has been completely discharged from the press, as indicated in Fig. 10; One-quarter of a revolutiony later, the parts will be in the position shown in Fig. 11, note gripper point G, which represents three revolutions of the cylinder 24. At this moment the inking means is still in the same position in which it was in Fig. l).

The ink supply means to the left of the counterpressure cylinder 24 is still down and the ink supply means to the right of the counter-pressure cylinder 24 is still up. The form section 22 is beneath the ink supply means at the right but will receive no ink. A short `time later the form section 22 will be to the left of the ink supply ymeans which is at the right, and then the ink supply means will reverse in position. The roller 93 rides upon the high portion 94b of the cam 94 causing the ink supply means at the right to move down and the ink supply at the left to move up.

One revolution later the parts will be as shown in Fig. 12, which represents four revolutions of the counter-pressure cylinder 24. It should be noted that the ink supply means at the right is now down and inking the form section 23. The inkv supp-ly means to the left is in its raised position so that the form section 22 may pass freely. One revolution later the parts will be in the positions shown in Fig 5, which represents five complete revolutions of the counterpressure cylinder 24. This view is identical to the view shown in Fig. 4. A new sheet S is now in position at the top of the counter-pressure cylinder 24 and the operation is ready to repeat.

While I have illustrated and described the preferred embodiments of my invention, it is to be understood that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and modications coming within the scope of the invention as defined in the appended claims.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent ils:

l. In a one cylinder two color press, a frame, a counter pressure cylinder for said press having gripper means lor engaging the lead edge of a sheet to be printed which is of a length equal to or less than one half the circumference of said counterpressure cylinder, a form holder reciprocally mounted on said frame and beneath said counterpressure cylinder and having two form sections with their leading edges spaced a distance equal to the circumference of said counterpressure cylinder, an ink supply means for each of said form sections and vertically slidably mounted and having form rollers which in the lowered positions of said ink supply means contact said form sections, means for alternately `raising and lowering said counterpressure cylinder for periods of two and one half revolutions so that in its raised position the form sections may pass freely and in its lowered position it will engage the form sections when they pass, means for rotating said counterpressure cylinder continuously in the saine direction, means for moving said form holder in one direction for one stroke of its reciprocation while said counterpressure cylinder is raised and in the other direction for another stroke of its reciprocation while said counterpressure cylinder is lowered, means for alternately raising and lowering said ink supply means so that in the lowered position of one of said ink supply means one of said form sections will be inked once during each period of reciprocation of said form holder, and in the lowered position of the other of said ink supply means the other form section will be inked once during each period of reciprocation of said form holder, and means for operating said gripper means to hold a sheet of f paper on said counterpressure cylinder for two revolutions thereof during a period that said counterpressure cylinder is down to print said sheet with both of said form sections and the start of the gripping operation repeating once for each five revolutions of said counterpressure cylinder, said means for alternately raising and lowering said counterpressure cylinder comprising slides vertically supported on said frame and supporting said cylinder, and means for raising and lowering said slides controlled with a cam, said cam having a high spot for one half of its circumference and a low spot for the other'half and cooperative with a roller on a pivotally mounted lever connected with a linkage system, in turn connected with said slides, said linkage system being arranged on the sides of said frame, and said slides being also arranged on the sides of the frame.

2. In a one cylinder two color press, a frame, a counterpressure cylinder for said press having gripper means for engaging the lead edge of a sheet to be printed which is of a length equal to or less than one half the circumference of said counterpressure cylinder, a form holder reciprocally mounted on said frame and beneath said counterpressure cylinder and having two form sections with their leading edges spaced a distance equal to the circumference of said counterpressure cylinder, an ink supply means for each of said form sections and vertically slidably mounted and having form rollers which in the lowered positions of said ink supply means contact said form sections, means for alternately raising and lowering said counterpressure cylinder for periods of two and one half revolutions so that in its raised position the form sections may pass freely and in its lowered position it will engage the form sections when they pass, means for rotating said counterpressure cylinder continuously in the same direction, means for moving said form holder in one direction for one stroke of its reciprocation while said counterpressure cylinder is raised and in the other direction for another stroke of its reciprocation while said counterpressure cylinder is lowered., means for alternately raising and lowering said ink supply means so that in the lowered position of one of said inl: supply means one of said form sections will be inked once during each period or reciprocation of said form holder, and in the lowered position of the other of said ink supply means the other form section will be inked once during each period of reciprocation of said form holder, and means for operating said gripper means to hold a sheet of paper on said counterpressure cylinder for two revolutions thereof during a period that said counterpressure cylinder is down to print said sheet with both of said form sections and the start of the gripping operation repeating once for each five revolutions of said counterpressure cylinder, said means for rotating said counterpressure cylinder comprises a prime. mover having a pulley engaged by an endless driving element engaged with a pulley mounted on a slide connected with and supporting said counterpressure cylinder, and an idler mechanism for maintaining the tension of said endless member.

3. In a one cylinder two color press, a frame, a counterpressure cylinder for said press having gripper means for engaging the lead edge of a sheet to be printed which is of a length equal to or less than one half the circumference of said counterpressure cylinder, a form holder reciprocally mounted on said frame and beneath said counterpressure cylinder and having two vform sections with their leading edges spaced a distance equal to the circumference of said counterpressure cylinder, an ink supply means for each of said form sections and vertically slidably mounted and having form rollers which in the lowered positions of said ink supply means contact said form sections, a slide supporting said counterpressure cylinder, means for alternately raising and lowering said slide to correspondingly raise and lower said counterpressure cylinder for periods of two and one half revolutions so that in its raised position the form sections may pass freely and in its lowered position it will engage the form sections when they pass, means for rotating said counterpressure cylinder continuously in the same direction, means for moving said form holder in one direction for one stroke of its reciprocation while said counterpressure cylinder is raised and in the other direction for another stroke of its reciprocation while said counterpressure cylinder is lowered, means for alternately raising and lowering said ink supply means so that in the lowered position of one of said ink supply means one of said form sections will be inked once during each period of reciprocation of said form holder, and in the lowered position of the other of said ink supply means the other form section will be inked once during each period of reciprocation of said form holder, and means for operating said gripper means to hold a sheet of paper on said counterpressure cylinder for two revolutions thereof during a period that said counterpressure cylinder is down to print said sheet with both of said form sections and the startl of the gripping operation repeating once for each five revolutions of said counterpressure cylinder, said means for rotating said counterpressure cylinder comprises a prime mover having a pulley engaged by an endless driving element engaged with a pulley mounted on said slide, and an idler mechanism for maintaining the tension of said endless member, said slide being provided with a train of gears for communicating the rotations.

4. In a one cylinder two color press, a frame, a counterpressure cylinder for said press having gripper means for engaging the lead edge of a sheet to be printed which isof a length equal to or less than one halt the circumferenceof said counterpressure cylinder,` a form holder reciprocally mounted on said frame and beneath said counterpressure cylinder and. having two form sections with their leading edges spaced a distance equal to the circumference of said counterpressure cylinder, an ink supply means for each of said form sections and vertically slidably mounted and having form rollers which in the lowered positions of said ink supply means contact said form sections, a slide supporting said counterp-ressure cylinder, means for alternately raising and lowering said slide to' correspondingly raise and lower said counterpressure cylinder for periods of two and one half revolutions so that in its raised position the form sectionsmay press freely and in its lowered position it willv engage the form sections when they pass-, mean-s for rotating said counterpressure cylinder continuously in the same direction, means for moving said form holder in one direction for one stroke of its reciprocation whilesaid counterpressure cylinder is raised and in the other direction for another stroke of itsreciprocation while said counterpressure cylinder is lowered, means for alternately raisi-ng and lowering said ink supply means so that in the lowered position of one of said ink supply means one of said form sectionswill be inked once during each period of reciprocationofsaid form holder, and in the lowered posi-tion of the other of said ink supply means the other formv section will be inked once during each period ofV reciprocation of said form holder, and meansfor operating said gripper means tohold a sheet of paper. on said counterpressure cylinder for two revolutions thereof during a period that said counterpressure cylinder is downto print said` sheetV with both of said form sectionsV and the start-of the gripping operation repeating once-for each five revolutions of said counter-pressure cylinder, said means for rotatingsaid counterpressure cylinder compri-ses a pri-me mover having a pulley engaged by a-n endless driving element engaged with a pulley mounted? on said slide, andl an idler mechanisml for maintaining the tensionof said' endless member, said slide being provided? with VaY train of gears for communicating-the ro tations, and said means for moving said form holder comprising a gear connected with Vsaid train ofY gears and meshing with a top rack mounted on said form holder, and in a lowered position of theY slide and counterpressure cylinder meshing with a bottom rack also mounted on said form holder.

5. In a one cylinder tworcolor press, a frame, a counterpressure cylinder for said press having gripper means for engaging the lead edge ofasheet to be printed which is of a length equal to or less than one half the circumference of said counterpressure cylinder, a form holder reciprocally mounted on said frame and beneath said` counterpressure cylinder and having twd form sections with their leading edges spaced a distance equal to the circumference of said counterpressurey cylinder, an ink supply means for each of saidl form sections and vertically slidably mounted and having form rollers which in the lowered position of said ink supply means contact said form sections, a slide supporting said counterpressu-re cylinder, means for alternately raising and loweringl said slide to correspondingly raise and lower said counterpressure cylinder for periods of two and one half` revolutions so that-in itsraisedposition the form sectionsmay pass f-reely and initsY loweredposi'tion it will engage thevfo-rm's'ec'tion's whenthey pass, means' for rotating'said counterpressure cylinder continuouslyin the same direction, means for moving said formwholderiirone direction for one stroke oflits reciprocation while said counterpressure cylinder isi raised` and in the other direction for another'strok'eot itsreciprccation whileA said counterpressure cylinder' islowered, meansfor` alternately raising-and lowering saidl ink supply means so that. in the lowered position of one of saidv ink supply means one of said form` sections-willbe-inke'donc'e during each period of recip-roc'ationl ot saidform holder, and in the lowered position of--the other of sai'd ink supply meansthe otheriformA section will be inked once during each period of reciproc'ation of said form holder, and meansfor operating said gripper means to hold a sheet of paper on. said counterpressure cylinderA for two revolutions thereof during aperiodthat -saidcounterpressure cylinder is down tov print'said sheet with both ot saidform sectionsand the start of .the gripping operation repeating Vonce for each ve revolutions `of said counterpressure cylinder, said means for rotating said counterpressure cylind'ercomprises a prime mover having a pulley engaged by an endless driving element engaged with apulley mounted on saidslide, and an idler mechanism forma-intaining thev tension of said endless member, said slide being provided with a trainof gears for communicating the rotations, and said means for moving said form holder comprising a gear connected with said train of gears and meshing with a toprack mountedonsaidormholder, and a lowered posi-tion of theislide and counterpressure cylinder meshing with a-bottom rack also-mounted on' said form holder,v saidmeansfor alternately raising and lowering said' ink supply means com-l prising rods connectedy with the ink supply means and connected with pivotallymounted bell cranks which are connected: by links eccentrically on a control disc, and meansfor turning said disc.

6'. In a one cylinder two'color press-v, a frame, a counterpressure cylinder for said press having gripper means for engaging the lead edgeof a sheet to be printed which is of a length equal" to or less than one half the circumference {1f-said counterpressure cylinder, a form holder reciprocally mounted on said frame and beneath said counterpressure cylinder and Vhaving two4 form sections'with their leading edges spaced a distance equal tothecircumferenceof said counterpressure cylinder, an ink supply means for eachk of'said form sections andv vertically slidably mounted and having form rollers which in the' loweredpositions of said ink supply means contact said form' sections, a` slide supporting said counterpressure cylinder, meansfor alternately raising and lowering said slide to correspondingly' raise andI lower said counterpressure cylinder for periods of'two and one half revolutions so that inits raisedfposition the' form sections may pass freely and in its lowered position it will engage the form sections when they' pass, means for rotating said' counterpressure cylinder continuously-inV the same direction, means for moving said form holderin one direction for one stroke of its reciprocation while said counterpressure cylinder is raised and in the other direction for another stroke of itsreciproca-V tion while said counterpressure cylinder isY lowered, means for alternately raising and lowering saidink supply meansso thatlinthe lowered position ofone of said inksupply means one of saidform sections will be inked once during each period of reciprccation of said form holder, and

in the lowered position of the other of said ink supply means the other form section will be inked once during each period of reciprocation of said form holder, and means for operating said gripper means to hold a sheet of paper on said counterpressure cylinder for two revolutions thereof during a period that said counterpressure cylinder is down to print said sheet with both of said form sections and the start of the gripping operation repeating once for each ve revolutions of said counterpressure cylinder, said means for rotating said counterpressure cylinder comprises a prime mover having a pulley engaged by an endless driving element engaged with a pulley mounted on said slide, and an idler mechanism for maintaining the tension of said endless member, said slide being provided with a train of gears for communicating the rotations, and said means for moving said form holder comprising a gear connected with said train of gears and meshing with a top rack mounted on said form holder, and in a lowered position of the slide and counterpressure cylinder meshing with a bottom rack also mounted on said form holder, said means for alternately raising and lowering said ink supply means comprising rods connected with the ink supply means and connected with pivotally mounted bell cranks which are connected by links eccentrically on a control disc, and means for turning said disc, comprising a link eccentrically on the disc and connected with a parallelogram of arms provided with a roller engaging a control cam.

'1. In a one cylinder two color press, a frame, a counterpressure cylinder for said press having gripper means for engaging the lead edge of a sheet to be printed which is of a length equal to or less than one half the circumference of said counter-pressure cylinder, a form holder reciprocally mounted on said frame and beneath said counterpressure cylinder and having two form sections with their leading edges spaced a distance equal to the circumference of said counterpressure cylinder, an ink supply means for each of said form sections and vertically slidably mounted and having form rollers which in the lowered positions of said ink supply means contact said form sections, a slide supporting said counterpressure cylinder, means for alternately raising and lowering said slide to correspondingly raise and lower said counterpressure cylinder for periods of two and one half revolutions so that in its raised position the form sections may pass freely and in its lowered position it will engage the form sections when they pass, means for rotating said counterpressure cylinder continuously in the same direction, means for moving said form holder in one direction for one stroke of its reciprocation while said counterpressure cylinder is raised and in the other direction for another stroke of its reciprocation while said counterpressure cylinder is lowered, means for alternately raising and lowering said ink supply means so that in the lowered position of one of said ink supply means one of said form sections will be inked once during each period of reciprocation of said form holder, and in the lowered position of the other of said ink supply means the other form section will be inked once during each period of reciprocation of said form holder, and means for operating said gripper means to hold a sheet of paper on said counterpressure cylinder for two revolutions thereof during a period that said counterpressure cylinder is down to print said sheet with both of said form sections and the start of the gripping operation repeating once for each five revolutions of said counterpressure cylinder,- said means for rotating said counterpressure cylinder comprises a prime mover having a pulley engaged by an endless driving element engaged with a pulley mounted on said slide, and an idler mechanism for maintaining the tension of said endless member, said slide being provided with a train of gears for communicating the rotations, and said means for moving said form holder comprising a gear connected with said train of gears and meshing with a top rack mounted on said form holder, and in a lowered position of the slide and counterpressure cylinder meshing with a bottom rack also mounted on said form holder, said means for alternately raising and lowering said ink supply means comprising rods connected with the ink supply means and connected with pivotally mounted bell cranks which are connected by links eccentrically on a control disc, and means for turning said disc, comprising a link eccentrically on the disc and connected with a parallelogram of arms provided with a roller engaging a control cam, said cam having a low area for half of its circumference and a high area for the other half.

WILLIAM R. HILDEBRAND. 

